java.util.concurrent.ExecutionException: java.lang.NullPointerException

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java.lang.NullPointerException:
at org.apache.catalina.startup.HostConfig.addWatchedResources(HostConfig.java:1172)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:706)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)

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